I can see you don't know much about ships, the 22ft in the measurement you gave is the bit under the water known as draught.
her dimensions are according to the register:
214.5m (703.74ft) long, with a beam over extremities of 32.64m (107.08ft), and the summer load line draught is 7m (22.96ft) (draught is the depth of water from the summer load line disk center to the bottom of the keel amidships)
some basic observation tells us, there is 10 decks above the water at the rear and 11 above the water at the front, other info tells us decks 5 and 7 were built at 1 1/2 height, and there is no deck 6 in the rear half, but anatomical proportions of humans tells us that there is probably at lest ~2.5m per deck, so from the water line to the top of the peoples heads on the upper deck must be at lest 2.5m * 11 = 27.5m, which is then plus the mast and the bridge and funnel, the mast is adding about 50% to the height, so 27.5m * 1.5 = 41.25m, you then have the 7m draught, so 41.25m + 7m = 48.25m (158.3ft)
likewise it is only rated for 1611 passenger, the crew is ~540 and their accommodation is in the main on the 12th deck which is under the water line.
but if you want a contras the Airbus A380-800 with a single class economy layout seats over 800 people and has a fraction of the crew in a significantly smaller package.